The retina is the
light-sensitive tissue at the back of the eye that sends
images to the brain.
Normally, the retina lies against the back of the eye where
blood vessels furnish it with oxygen and nutrients. Tears in
the retina may impair vision and lead to a detached retina.

A detached retina occurs when the
retina pulls away from the inside wall of the eye. When this happens
vision becomes blurred, shaded or distorted.